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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1f672f1b8c8cdde42e5bedcf572e3a00d1ebda76ac299476df83a4ac6c532e' 
  AND token = '7EGeko/oIJtEH61oL2iV2hdsg/A2paWVFWRrtE4xGEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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