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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ec053800ff23b6d7e58feead4733ee02c3f995dc62805f1d3de3ca9deff09f' 
  AND token = 'xgIDeYOjJ0TR6RjzInQDq0Z8dPDPpyW/Vqb9l8rLx0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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