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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14796bb63ed876565b3bc911b512eb9e92e91e8b395a890c4541e37229b9e35' 
  AND token = 'AGi4VPr542pcASyJV9o1+CoZzl09uHB3QqhP0ZrRZWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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