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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8c17e61cd6a97ca126e334f52f36b8f2a99ec8543402a7f1de3e8afa49bff9' 
  AND token = 'gmCCuOzZuF+PM1zZbboGu2iOX+m0x49Q6E9C7emvDXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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