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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f42738f56cb6b13a912c77a38d7ad7827f9ffbcb6c0ad14113501f289dddda' 
  AND token = 'P1KbkVB/BS/euouBCWy9CUDgU3x7WIr8t0Ffegv2S/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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