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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658a6305630afbc3533553435d4a144d853f735f6e8aaf9d5ec0f3803fa2e925' 
  AND token = 'cxrqeVWON+0cR0JSBXLmJilkEd5V1w+12YwtLYj7j8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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