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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b3a7722c6d022617e79c151195e164186dcb92a356226ae83dceb07b1ce28b' 
  AND token = '9GeMNOnfYlm0YGZCV8le+wmG4SJsjPgg1pRemv5qyOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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