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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c6aea3c5dafbf2170734f1fa8e0875b4d0e8314597a889e190bd9cf468e8b6' 
  AND token = 'DRf1GGzgP20abGp/0RShonUYGMBl8KAGnvIvPyEIJVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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