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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a5a73fa87fe9f3a0d16dc5d9ee4e67f34bfb286ef7e839b4ff64aa1a20236b' 
  AND token = 'eyPN/xXQuYEHrAYgYtnrHoTX60AYGYF/dvPK5BYlFys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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