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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba20d6439b33ce0ea849c00dad7c6600742eeb9dc8426c90db2ed8510101c58' 
  AND token = 'mATOoRHlXAlWXUs67lpK9d1vx5Xy0hPq87ptND5R52g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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