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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac471199484deb01a7eed79a32c2e48e58bc62529b0421719b8ae3137e36c33' 
  AND token = '4HKpgqjb/doNk9mGgcquAKx84A4CCPRVd9ekp44Vow4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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