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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f574d8021a274ef08ffd91702328d4ac8e6862e3a5f1fca0a5711cf0e8be2724' 
  AND token = '8FcFUgu14yFBmfzYyRWa3NLT6Vv3EhT/PIWeIwHLog8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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