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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db7cdf82644911c281445f68e658d1296703bf078d4d5cc455187b7e352c44c' 
  AND token = 'XHtQUHit1R27dlQKlqElw4qbm3EHB0qx1XEaJ64snNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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