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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f850f096ae9a5c7fb87c99de8f4791c8fef2b54821b74fa26f9dd8348bb67d9' 
  AND token = 'KdK7o9Ko0+MEpVN2OUYIbJNAJTgwNgimToMC7XLUyvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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