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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82882b08584760ae20a3d282f59597a8399d79ac9f88cdd6207f4e10d88005a9' 
  AND token = '1axfL5NE1Ssr8jyYPbgv4KdBLby0FsJBXkcqi5dsE3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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