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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c8c5275be63743ec9e9d39b0456db0a693361500a4e7c33e8fc6cc5626db92' 
  AND token = '3a25gM+kxPEXmdU/jO6t2JSeLv8iZYtknaCLeYuO42M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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