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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b4b0008dad32375766b3de064a8d804ce1318da4863815cbdc489652cca685' 
  AND token = 'XaKH0mZ1DyWPsZ05sGlK/Ypjrb3kYei6NqWvb6+e1Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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