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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036c9177f1eee60a8802169a350b47b93868aa5d1bf1b960ef0034936406edfc' 
  AND token = '2Pqn8vc3doNxYUZ/QRgaqKZIssV8RTe7ppvTjcY2PHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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