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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f167ada44ee1705c4d6b86d789305861f367a32a1cebb0cbc08a973576bfd32' 
  AND token = 'OFm6Klc+nEWsge2kfjQpeB7AYB0xNdwOSHAP1KYhq00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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