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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc912ac234dd0238ccafd8fd25e0bc4ba74abd72e53779e7a0b9513afe8c064a' 
  AND token = '7pPvxttkgF/q9c0X22cTx9IxZWgCcpUTHLtzevYyPn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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