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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e66a49766e3ef37dc1179af301b1a7f8c2b07d7f0c34c117147fc791c19672' 
  AND token = 'tgogkawiOG+Ggc+uYdVUW/7Hbl4L1Mw4ztjSd3X3BbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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