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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2e2e515aba5f2bd692aa6bcc348d7e04734861bd717aa1ed63962063ca8bf6' 
  AND token = 'Gow0TM/lfQxtT8XLWVRSWqZdhpuyNDYW/Vm3tzVe7tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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