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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4cade464857e386ec54d36aa042f393ff7263a11497d9fec987cdeb73b5148' 
  AND token = 'NA0IllWfjgRYCw6L40tJlxAsCsO5lXU/zrQljEEw9wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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