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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ca7c112f5a5753876d4a207490a25e7346194c1a9d545e2b2e3207d9da127d' 
  AND token = 'lnJZ9MII0w7UJcXNcMnNJbn4y3k/N0L6WNu1IicSbbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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