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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8727c9c96d33fc127f2450bb54c95c4edc15957310f8978a605ce0175becca' 
  AND token = 'XUWS5a80OBdvKEgPexFbQpwvaX0GQ1RI1msdfcftrAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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