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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0076bd207c0ba2773d9ed24114218da7684bcb8236486033a22b8f100de2c70' 
  AND token = '5pXGPf8pH8/o7CrM4kyGfB3P8BrLcYgmMblVUe+hWTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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