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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140b55eaa17952ecb5a171335d6a7e5f379bb3c8b12b17151ff0c7b5a3c7d7b2' 
  AND token = 'aS5nIzNMvWuzaUvOLCY91rlfxQbtH32gK9/sLj2jecY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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