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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15d2c65739801b4dffb741f12cf4e5cfab126ea70abb30047692671c5c331ca' 
  AND token = 'mzCy6UdaBY3F6ULhMgE0vSeTQ/qdox3Q1Yh3SoY/9dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}