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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056078f61c0c4d099835a36bee5cf68a2c231b79d27aba1d55e52516543e8967' 
  AND token = 'ii9zLnXq0FyBV48K1LEFHF3xzorPkyd2A+a4uf+g+u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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