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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46d97a7b6df50e02b5c83688e0f9b10a5dc1f4762f83a028995e0d72f12fb4c' 
  AND token = '7sX20PSD2zihWfdYfMGfWfAstaZx9G8ZVphmHBYLlQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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