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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2d1c2fe55a32322b31470c356116d535f627b4885557faa80fe07b481996eb' 
  AND token = 'RRIfbDXxY4NdOxQ1uqplUyZ89Kpsca4GWpc4X8Ytl7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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