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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb0630802313f29cecef4ca748d87b712e503cb5f861cbfac9a8d941d54a50b' 
  AND token = '941QlPdmwQAmjg8+tQepR1OMyvPVRl5HHZLNe5q7u7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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