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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc1d2f29eaa794da461cdf79a0b3d6279ab03a6d693041f18d105dc31b31cc9' 
  AND token = 'i/SGHcudG8EhAscGWn3c6DnLKI5NqnBjmEFQnWG3b9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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