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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a577275f0e8f2ceeb78e611a6b9d75b7ae57b711657b4886748e39140a8ef9' 
  AND token = '+nHuPBF4a7spt6lM49y1jOGiHP1oSxPhA6g9BwZKp0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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