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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ef1a26acf0d447e1ebc1c65ddd8e2ac903b792712e320af9e7543687bb967d' 
  AND token = 'qSyPbJ7gRRa+NI+ovzMdlj5jeAk6b9dM4hE7xIdkghQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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