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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8892b4c05e73379983b653373d47457bcecd78e09ad12037e95517c95d8eebc4' 
  AND token = 'I4czh5d3xpkaUlAJzxozWw4gGCIA7Gby+QjNG0FfurA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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