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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5ee240bff5865c1720bb0d98354db040eec9c4c5b0fc68315a95826a919513' 
  AND token = 'rwQqBY+Q3Od0Ck2ZXeQZke9c4HUgwnArok+rSsrWzKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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