SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5858c812cedbe733e9ff2af3e2a41a42fa850e14b5e2b42030f305e90a2f182' 
  AND token = 'BQBGbL1ESabQ+4XGjenSuL+avLmPP2H1yXn3B54f2rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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