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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7fd3eada0e764b3fb726f49b592a1f4f19d431a202126bca3f3cbb29b2e5a1' 
  AND token = 'qO7RgM+GnR6JlLbZ2EUSP+o8LetTTGLZkJ8k6xF/FK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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