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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58858046bf776ffc198fed51e4a554681ef6f32f1e8afa642ea6e56b13a9460b' 
  AND token = 'FYqilXnzPNd5V0lNFfMtxldknCoYgM41/GVBC1eW4so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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