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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd328474c2fe72f6c484c2cfef125c2627b568a5f72eaaf2a75d7e79daef4fb6' 
  AND token = 'sIyBpLUsYiSBgj4/AoUe7RYGEqEJL3KQ4tlEOZeJAJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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