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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055ec0efdebeb82ee176c0ad630a287f06917c2aeb7ffba61de75b6236ea00cb' 
  AND token = 'sDp1yz8po1bmDXFF51oddJgH0KQeS+rJhxk/L7bxoVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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