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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ba71fd1677ff52ba94e0da990e7cbb11ca1be086d5b22e924032f5cb8f7f4b' 
  AND token = 'Q5bF/w0iqzuPdaflDwr+6UIeScKwi3UKGZUWfJApwUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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