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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd919b21e31667c631a8c55622f9563d50e16d75961e3c9c60c4bba2ab989b4' 
  AND token = 'tB62WHKfo3T65zA0JmsxNBCx4KojZGJrjoq2DRtWis8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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