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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d862f37951014b8b902e0e99129f09df0e0b16bfcad891629707292479cf3d8' 
  AND token = '2VEXZ+8W3sBP5EQFn+nISNycsldBN7a5myy850x9P8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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