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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45ff027d7a5a15552df98138e215e267d01b1ff6665f065a09b1805e37a30a2' 
  AND token = 'Bi4uF5sUsW+Z5ShjBOyV/O83OovwNZNnnM886uclEV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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