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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996351c0d9ae61b7c95558761d644f19e73850eecae4bdb1a4274fc6a859e4f3' 
  AND token = 'KXL+A4FMzfdqv9XvdSd0dC7swoCgCxtX9ix7lWx+u1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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