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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b146441f6df8c92655a83602b4b062f0ea7444415a4294ca8a2766e4120a2c8' 
  AND token = 'clk1TA/fzDRMh7KTRHOodopzbQleGfuCNLfbYcAmYC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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