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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1eee4fbb57517b55cc21c828e5055a3d5f9ee11a548000390aea3a7e2b3db58' 
  AND token = '3gi0GaZiKQ6oRDuOYtkeDhQBR4VfeAjFcBPwHSrGkeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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