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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd63d9b92efc8506bda714ba57b9e164154f1dd5d6f647357d87c99e7556a6fb' 
  AND token = 'q/Cs+W+kHyTbsr0kkQuPT0hOFaHBc35KU+BjL1Rc+Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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