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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2353b1f5b7b065f4d27c7093a6c345eb3fb76e61c161f454792ba79bbe2bd500' 
  AND token = 'OgW484h1IjWG+KOf9rxlu3c2DDQj/9aPxeL3GnijSPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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