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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e68d47aceb49797cc8e1390d941f0bc76cb1088be14aa850803cb60cc4dd8e' 
  AND token = 'rUruLu8SStyMDwTOUQkr7QuzcFdYCsmC61WNK2/fjao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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