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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9ef5541d800d56abc85a310a9c7ef6d8e68efc8f637d8c389bb28a004e3e17' 
  AND token = 'UaCNJMB+XMbaQrHAJAeOx5Rp9exK2Xq3+lzgPNwuVGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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