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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8d026263096f9d645c45d3720c9e6d1945fb83873b4c728135627eee21fadf' 
  AND token = 'ACJ5z2NhtL1UFN0WznsWO/7FCDG9ttyQ8p398SnnWeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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