SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de7f769f7882bdf2b18e78e91e07096bebbc11b7c4630b5fa50d79eb96d1eb6' 
  AND token = 'JigmzrZBkAcvBLDNuL3Ao/KWdT3sJGuPPFCYKch5AzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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