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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efd5dbc1cdd75dc6d9c68422a7df575b7ab7d3c906cc7675a41835e7fc94df1' 
  AND token = 'V5EAJJ6oiLqODNaFpl9jhiyoevPhbn7xI1x5GN1UBRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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