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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3910853490b319091ee82cbb920703428822a48be28cf5baa3ca1e67bd774b' 
  AND token = 'KTN62kk0I82ra0lHfyoAoZj/oLuuENf6nr57PAe0omQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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