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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f77a99b89ceab6c9ce358e5fc864d6d9a01cadb373d3abf2b4952aaa1c6915' 
  AND token = 'lmHWKnlGVoEPUBX0n4zsyaR9GJdXROA9FvytXekw7f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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