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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccb9b6e2ebad1bcd69ab373c3141a548a05b6c97f830478048e52f14fa59d46' 
  AND token = '3oxKoc2kZyk6wI9G4SP1KEzfhaKe5RhM4TOtDyja2zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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