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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bae55afe64c1c4e108219aea81c24f107592a8d5a80ee1a791de6d7aa57caf2' 
  AND token = '21wEbJk8C6cJxGCeqLcjndYddNChAG4fuBQ7JpHK4ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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