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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8f81ee45ed6e48759c92d36dd0a7d2da5ef50c9c4306ca4c62291ab9681ada' 
  AND token = 'ZNe5rsc7u740kECdDbsW+ezwmGHr8Y88aJ3AbdCah8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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