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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c765ed455b978a153dc49036bcbb3afde74ef9f3505e95cd386d22be5e4d32' 
  AND token = 'Ie8GA1GogVKWFFCzANrX9zQHijhbdEnlANHZfdmdrLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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