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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f858cc73ee7ce6908c0ef6a9e270cf4b677e6b158e5fcd4b4a3528105f55f36c' 
  AND token = 'YQNLKQwBzfRo7oGH8WoE4042s0t0ZOol3Z6jgJsjwJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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