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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42bbfc7c72792426e0267fb396aabecff04618e4609996d2c173a311a9b061fb' 
  AND token = '23hLDgQWVUThQK7/oSf2HJXHXtJSZwB6Y1mhMyMaLxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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