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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81135842103d3e07d0483ffd2b63e8da761ac4f937e9f2456f12089c49c517cd' 
  AND token = 'FYIbNivNMpOiT4BZ/O5poggcIHhE/qkvvtfxcnar6Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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