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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b13ede759a64d05194f45d207c60c0689ae8b5dbee96d2ed7d9af8fa6140a0c' 
  AND token = 'Me4FO8RBtMDggQ81mV3oDXKobzCxK51eMfUa31sH2q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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