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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb13426630cb65a62cf457d9deed6e6a340b432177109a1b6903f47196dfa15' 
  AND token = 'vayAneRGlWNmaTL/kWH1pmyke6R11K8TR5sPpRUfhgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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