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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9c145350d1246b46d7909ae757988d68ebd7648a57c6c13dea61c1673b11f2' 
  AND token = 'ZPBNKajTF/mx1Uj2d6D17LGJMQsIcR05tPnWLJHOzUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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