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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8d879790471d5b4583855ae5d8e84e2a546f886debdbbe76a996465c0d143d' 
  AND token = '5Xs2+06Mweq+dOCGM7dQNwg+QA85/0HSA2VeMApa2rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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