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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73f17058d1f1a2b2f00a94adad21e8b92b1c77bc57ec40ff642fa28fced8fb5' 
  AND token = 'TEOyH35Ft8jqHPA7uV+QIHI/Pb6R1W3t4EbhsTWM9dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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