SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92072a94749a3e8f2865f572765cf114e35154d9668cea3b4ed0d1bbb3ddcac5' 
  AND token = 'OqjZBNofht0z1DuGjZa3g+8nY0hLg9fy8Z8cDuGeOZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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