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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11ff46ee05e1f43942a073ee851a9cf47dea2f267ef249445b3533827111797' 
  AND token = '3FSSmjL+KvkS3OqK7D1aKZ5EOiVkUXAk+R8ahw8br74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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