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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b82c183f2e32442459d96b74b52e0b9c386922bb96547ff60d24b7d385e885' 
  AND token = 'FekE1VqYnOiOur/H1XzOpFzyxVNteRB1YDcEwcTm+tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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