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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d132b6c1879ef6af3bacdc42d53a3904de3054e49b7c500ab5c97be192c1b5' 
  AND token = 'gcZdKQ86tCGos79X2rL7krNnZ6BL/MZQYhgXjkCGEss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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