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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c88a51364ef632bb91d5dc88f025ba60efc4d8163d01284abad0e6eda7c71c0' 
  AND token = '1zQ7Zb9XQ6u7n+U9SQL198KwdL2yy0EBQuhwHlpo0Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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